Why Do Small Degrees of Warming Matter?

From an AP story by Seth Borenstein and Dana Beltagi headlined “Why do small degrees of warming matter?”:

On a thermometer, a tenth of a degree seems tiny, barely noticeable. But small changes in average temperature can reverberate in a global climate to turn into big disasters as weather gets wilder and more extreme in a warmer world.

In 2015, countries around the world agreed to cut greenhouse gas emissions to limit global warming to “well below” 2 degrees Celsius (3.6 degrees Fahrenheit) and pursue a goal of curbing warming to 1.5 Celsius (2.7 Fahrenheit) as part of the Paris Agreement.